The seeded growth of dense and thin SAPO-34 membranes on porous α-Al2O3 substrates under microwave irradiation

Liu, Xiufeng; Du, Shuyun; Zhang, Baoquan

doi:10.1016/j.matlet.2012.09.076

Cited by 14 publications

(4 citation statements)

References 17 publications

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“…The enhancement was attributed to the avoidance of defects in the membrane formed by the organic template after high-temperature calcination. SAPO-34/α-Al 2 O 3 disk membranes were prepared by seeded growth using the microwave irradiation method for the first time by Liu et al [ 107 ]. This synthesis route led to a homogenous, thin, and dense SAPO-34 layer on the α-alumina disk, which improved the separation properties.…”

Section: Sapo-34 Membranes For Co 2 Separationmentioning

confidence: 99%

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Usman

2022

Membranes

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In the zeolite family, the silicoaluminophosphate (SAPO)-34 zeolite has a unique chemical structure, distinctive pore size, adsorption characteristics, as well as chemical and thermal stability, and recently, has attracted much research attention. Increasing global carbon dioxide (CO2) emissions pose a serious environmental threat to humans, animals, plants, and the entire environment. This mini-review summarizes the role of SAPO-34 zeolite membranes, including mixed matrix membranes (MMMs) and pure SAPO-34 membranes in CO2 separation. Specifically, this paper summarizes significant developments in SAPO-34 membranes for CO2 removal from air and natural gas. Consideration is given to a variety of successes in SAPO-34 membranes, and future ideas are described in detail to foresee how SAPO-34 could be employed to mitigate greenhouse gas emissions. We hope that this study will serve as a detailed guide to the use of SAPO-34 membranes in industrial CO2 separation.

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Section: Sapo-34 Membranes For Co 2 Separationmentioning

confidence: 99%

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Usman

2022

Membranes

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“…Teflon liners [15,21,44,45]. Chew et al [44] prepared 1-2 μm thick membrane with 3 layers after MW heating at 200 °C for 2 h, but no separation performance was shown.…”

Section: Microwave (Mw) Treatment Has Been Used To Synthesize Sapo-34mentioning

confidence: 99%

“…Chew et al [45] also prepared H-SAPO-34 with 3-4 μm thickness for CO 2 /CH 4 separation after MW heating at 200 °C for 2 h, which had CO 2 permeance of ~1700 GPUs. Liu et al [21] showed SAPO-34 membranes prepared by microwave-assisted heating at 180 °C for 2 h to obtain a thickness of ~3 μm, in which no permeation test was carried out. Shi [15] prepared 9-10 μm thick SAPO-34 membranes with CO 2 permeance of 1,075 GPUs for the CO 2 /CH 4 separation.…”

Section: Microwave (Mw) Treatment Has Been Used To Synthesize Sapo-34mentioning

confidence: 99%

Thin SAPO-34 membranes synthesized in stainless steel autoclaves for N2/CH4 separation

Zong

Carreón

2017

Journal of Membrane Science

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SAPO-34 membranes were synthesized in stainless steel autoclaves and Teflon autoclaves with water bath, ice/water bath and flowing water cooling towards N 2 /CH 4 separation. The best membrane displaying unprecedented N 2 permeance of ~2,600 GPUs and N 2 /CH 4 separation selectivity of 7.4 was prepared in the stainless steel autoclave with a water bath cooling. A more selective membrane with a N 2 /CH 4 selectivity of 8.6 and N 2 permeance of ~2,150 GPUs was also prepared in the stainless steel autoclave but with an ice/water bath cooling. The heat flux rate of the stainless steel autoclaves during membrane preparation was ~two orders of magnitude higher than that of the membranes prepared in conventional Teflon autoclaves. The higher heat flux rate decreased the gel temperature faster, and slowed the kinetics of crystal growth. The slow crystal growth rate during the cooling translated into thinner and more permeable membranes. These SAPO-34 membranes may have great potential for economic N 2 rejection from natural gas.

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“…As a kind of zeolitic fillers, SAPO-34 zeolite should have gained more attention for CO 2 /CH 4 separation because its chabazite (CHA) structure has a 0.38 nm framework pore size, which is larger than the kinetic diameter of CO 2 molecules (0.33 nm) and similar to that of CH 4 molecules (0.38 nm). , Several years ago, SAPO-34 zeolite was touched on as a zeolitic filler for preparation of MMMs. Zhao et al incorporated SAPO-34 zeolite into Pebax 1657 for CO 2 separation and found the severe agglomeration of embedded SAPO-34 grains, resulting in the formation of pinholes and nonselectivity defects in MMMs.…”

Section: Introductionmentioning

confidence: 99%

Mixed Matrix Membranes Incorporated with Aminosilane-Functionalized SAPO-34 for Upgrading CO₂/CH₄ Separation Performances

Zhao

Liu²,

Liu

et al. 2021

Ind. Eng. Chem. Res.

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Mixed matrix membranes (MMMs) are challenged by the poor compatibility between fillers and a polymer matrix that leads to the weakened performance for gas separation. The surface modification of fillers with aminosilane should be an effective approach to improve their compatibility within the polymer matrix. 3-(2-Aminoethylamino)propyl-dimethoxymethylsilane (APDS) was used as a silane coupling agent for modification of sheet-like silicoaluminophosphate-34 (SAPO-34) crystal grains, and novel MMMs were fabricated by incorporating APDS-modified SAPO-34 crystal grains into a Pebax MH 1657 polymer. Based on characterization using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and mechanical tests, the incorporation of an APDS-modified SAPO-34 into Pebax matrix led to much enhanced interfacial adhesion within the MMM. In addition, the effect of the filler content in the MMM on the separation performance of a CO2/CH4 gas mixture and pure gases (CO2 and CH4) was investigated. Compared with available Pebax-based MMMs in the literature, the prepared MMM containing 8 wt % APDS-modified SAPO-34 exhibited the satisfactory CO2 permeability of ca. 137 Barrer and the highest selectivity of 34.7 for the CO2/CH4 gas mixture. It was believed that the excellent separation performance and good stability of the prepared MMM in this study should be due to the good interfacial compatibility of APDS–SAPO-34 fillers together with their strong affinity for CO2 within the MMM.

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The seeded growth of dense and thin SAPO-34 membranes on porous α-Al2O3 substrates under microwave irradiation

Cited by 14 publications

References 17 publications

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Thin SAPO-34 membranes synthesized in stainless steel autoclaves for N2/CH4 separation

Mixed Matrix Membranes Incorporated with Aminosilane-Functionalized SAPO-34 for Upgrading CO₂/CH₄ Separation Performances

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The seeded growth of dense and thin SAPO-34 membranes on porous α-Al2O3 substrates under microwave irradiation

Cited by 14 publications

References 17 publications

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

Thin SAPO-34 membranes synthesized in stainless steel autoclaves for N2/CH4 separation

Mixed Matrix Membranes Incorporated with Aminosilane-Functionalized SAPO-34 for Upgrading CO2/CH4 Separation Performances

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Product

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Mixed Matrix Membranes Incorporated with Aminosilane-Functionalized SAPO-34 for Upgrading CO₂/CH₄ Separation Performances